diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/platform/x86/Makefile | 1 | ||||
| -rw-r--r-- | drivers/platform/x86/chromeos_laptop.c | 205 |
3 files changed, 217 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 7ab0b2fba50..585db6fa64b 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -79,6 +79,17 @@ config ASUS_LAPTOP If you have an ACPI-compatible ASUS laptop, say Y or M here. +config CHROMEOS_LAPTOP + tristate "Chrome OS Laptop" + depends on I2C + depends on DMI + ---help--- + This driver instantiates i2c and smbus devices such as + light sensors and touchpads. + + If you have a supported Chromebook, choose Y or M here. + The module will be called chromeos_laptop. + config DELL_LAPTOP tristate "Dell Laptop Extras" depends on X86 diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index bf7e4f935b1..ace2b38942f 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -50,3 +50,4 @@ obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o +obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o diff --git a/drivers/platform/x86/chromeos_laptop.c b/drivers/platform/x86/chromeos_laptop.c new file mode 100644 index 00000000000..a8329c3a9d0 --- /dev/null +++ b/drivers/platform/x86/chromeos_laptop.c @@ -0,0 +1,205 @@ +/* + * chromeos_laptop.c - Driver to instantiate Chromebook i2c/smbus devices. + * + * Author : Benson Leung <bleung@chromium.org> + * + * Copyright (C) 2012 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/dmi.h> +#include <linux/i2c.h> +#include <linux/module.h> + +#define CYAPA_TP_I2C_ADDR 0x67 +#define ISL_ALS_I2C_ADDR 0x44 + +static struct i2c_client *als; +static struct i2c_client *tp; + +const char *i2c_adapter_names[] = { + "SMBus I801 adapter", +}; + +/* Keep this enum consistent with i2c_adapter_names */ +enum i2c_adapter_type { + I2C_ADAPTER_SMBUS = 0, +}; + +static struct i2c_board_info __initdata cyapa_device = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, +}; + +static struct i2c_board_info __initdata isl_als_device = { + I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR), +}; + +static struct i2c_client __init *__add_probed_i2c_device( + const char *name, + int bus, + struct i2c_board_info *info, + const unsigned short *addrs) +{ + const struct dmi_device *dmi_dev; + const struct dmi_dev_onboard *dev_data; + struct i2c_adapter *adapter; + struct i2c_client *client; + + if (bus < 0) + return NULL; + /* + * If a name is specified, look for irq platform information stashed + * in DMI_DEV_TYPE_DEV_ONBOARD by the Chrome OS custom system firmware. + */ + if (name) { + dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, name, NULL); + if (!dmi_dev) { + pr_err("%s failed to dmi find device %s.\n", + __func__, + name); + return NULL; + } + dev_data = (struct dmi_dev_onboard *)dmi_dev->device_data; + if (!dev_data) { + pr_err("%s failed to get data from dmi for %s.\n", + __func__, name); + return NULL; + } + info->irq = dev_data->instance; + } + + adapter = i2c_get_adapter(bus); + if (!adapter) { + pr_err("%s failed to get i2c adapter %d.\n", __func__, bus); + return NULL; + } + + /* add the i2c device */ + client = i2c_new_probed_device(adapter, info, addrs, NULL); + if (!client) + pr_err("%s failed to register device %d-%02x\n", + __func__, bus, info->addr); + else + pr_debug("%s added i2c device %d-%02x\n", + __func__, bus, info->addr); + + i2c_put_adapter(adapter); + return client; +} + +static int __init __find_i2c_adap(struct device *dev, void *data) +{ + const char *name = data; + static const char *prefix = "i2c-"; + struct i2c_adapter *adapter; + if (strncmp(dev_name(dev), prefix, strlen(prefix)) != 0) + return 0; + adapter = to_i2c_adapter(dev); + return (strncmp(adapter->name, name, strlen(name)) == 0); +} + +static int __init find_i2c_adapter_num(enum i2c_adapter_type type) +{ + struct device *dev = NULL; + struct i2c_adapter *adapter; + const char *name = i2c_adapter_names[type]; + /* find the adapter by name */ + dev = bus_find_device(&i2c_bus_type, NULL, (void *)name, + __find_i2c_adap); + if (!dev) { + pr_err("%s: i2c adapter %s not found on system.\n", __func__, + name); + return -ENODEV; + } + adapter = to_i2c_adapter(dev); + return adapter->nr; +} + +/* + * Probes for a device at a single address, the one provided by + * info->addr. + * Returns NULL if no device found. + */ +static struct i2c_client __init *add_smbus_device(const char *name, + struct i2c_board_info *info) +{ + const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END }; + return __add_probed_i2c_device(name, + find_i2c_adapter_num(I2C_ADAPTER_SMBUS), + info, + addr_list); +} + +static int __init setup_lumpy_tp(const struct dmi_system_id *id) +{ + /* add cyapa touchpad on smbus */ + tp = add_smbus_device("trackpad", &cyapa_device); + return 0; +} + +static int __init setup_isl29018_als(const struct dmi_system_id *id) +{ + /* add isl29018 light sensor */ + als = add_smbus_device("lightsensor", &isl_als_device); + return 0; +} + +static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = { + { + .ident = "Samsung Series 5 550 - Touchpad", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), + DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), + }, + .callback = setup_lumpy_tp, + }, + { + .ident = "Samsung Series 5 550 - Light Sensor", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), + DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), + }, + .callback = setup_isl29018_als, + }, + { } +}; +MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table); + +static int __init chromeos_laptop_init(void) +{ + if (!dmi_check_system(chromeos_laptop_dmi_table)) { + pr_debug("%s unsupported system.\n", __func__); + return -ENODEV; + } + return 0; +} + +static void __exit chromeos_laptop_exit(void) +{ + if (als) + i2c_unregister_device(als); + if (tp) + i2c_unregister_device(tp); +} + +module_init(chromeos_laptop_init); +module_exit(chromeos_laptop_exit); + +MODULE_DESCRIPTION("Chrome OS Laptop driver"); +MODULE_AUTHOR("Benson Leung <bleung@chromium.org>"); +MODULE_LICENSE("GPL"); |